I never thought to check your resistor values because ...I thought you would have double checked that before ever asking for help.

with R14 a 1K instead of a 1M pull down...you are pulling the signal down to ground! No wonder the signal disappears at the beginning of the circuit!R15 at 1M instead of 1K will effectively block the signal as well.Then the signal will get sucked to ground at the end of the circuit with R15 as a 1K.

Check ALL component values and change them to the correct, listed values.

Oh no!! Seems I really swapped the 1K and the 1M resistors …I have just put them in the right place, but still no sound. I’ll do another check with the audio probe in a few hours and also check all other resistors again…Thanks so much so far!!

OK, thank you so much for all the help!I’ll have another try with new op amps and soldering the components to the PCB directly. And if it still doesn’t work, I’ll try to get the layout on a breadboard and then on a stripboard.I could also try the positive ground schematic then.

I think I found the mistake. My pot wiring (I had posted a pic of it here) is completely wrong. Pot A is Pot B and Hot is Cold ... I'll change it tomorrow and let you know if it works.Maybe this was not the only mistake, but perhaps the last mistake left

Since the board is still not working, I have reconstructed daverdave’s vero layout based the geofx schematics and the small preview image of the vero layout which was still on Google.This one’s positive ground now.I’ll build this next week.

Parapedal.jpg

You do not have the required permissions to view the files attached to this post.